package com.jinzihan.dao.impl;

import com.jinzihan.utils.JDBCUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public abstract class BaseDao {
    private QueryRunner queryRunner = new QueryRunner();

    public int update(String sql, Object... args) {
        Connection connection = JDBCUtils.getConnection();
        try {
            return queryRunner.update(connection, sql, args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    public <T>T queryForOne(Class<T> type,String sql,Object... args){
        Connection connection = JDBCUtils.getConnection();
        try {
            return queryRunner.query(connection, sql, new BeanHandler<T>(type),args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public <T> List<T> queryForList(Class<T> type,String sql,Object... args){
        Connection connection = JDBCUtils.getConnection();
        try {
            return queryRunner.query(connection,sql,new BeanListHandler<T>(type),args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public Object queryForSingleValue(String sql,Object... args){
        Connection connection = JDBCUtils.getConnection();
        try {
            return queryRunner.query(connection,sql,new ScalarHandler(),args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}
